Abstract
PurposeTo investigate the patterns of medial meniscus (MM) tears in patients with varus knee osteoarthritis who underwent total knee arthroplasty and analyze the factors that could affect MM tears.Materials and MethodsThe patients (365 knees, 268 patients) were classified into three groups; group I with MM posterior horn (PH) tear only; group II with MM root tear only; and group III with MMPH plus root tear. The following factors were evaluated: age, gender, body mass index, varus deviation of the mechanical axis, medial proximal tibial angle, posterior tibial slope (PTS), and anterior cruciate ligament (ACL) integrity (normal, degeneration, and tear or absence).ResultsMM tears were identified in all knees. The patterns of the combined MMPH tears in group III were less complex than those in group I. Varus deviation and PTS were significantly greater in group III than groups I and II. In group III, there were significantly more cases of ACL tear or absence than groups I and II. The others showed no differences among three groups.ConclusionsSevere varus knee osteoarthritis was always accompanied by MM tears. Risk factors for MMPH plus root tears were severe varus deformity, great PTS, and ACL tear or absence.
Highlights
The weight distribution function of the meniscus is maintained primarily by circumferential hoop tension, the loss of which has been extensively implicated in the development of osteoarthritis[1,2,3])
Group III with posterior horn tears and root tears was composed of 87 knees (23.8%); the combined posterior horn tears were complex in 38 knees (43.7%), horizontal in 40 knees (46.0%), and radial in 9 knees (10.3%)
The prevalence of intact anterior cruciate ligament (ACL) during operation was significantly high in group I compared to groups II and III; the incidence of ACL tear or absence was remarkably high in group III compared to groups I and II (p
Summary
The weight distribution function of the meniscus is maintained primarily by circumferential hoop tension, the loss of which has been extensively implicated in the development of osteoarthritis[1,2,3]). Several studies have demonstrated that the loss of hoop tension in knees with root tears of the medial meniscus (MM) would cause uneven weight distribution across the knee, eventually resulting in progression of osteoarthritis[4,5,6,7]). We investigated the presence and patterns of MM tears in patients with severe varus osteoarthritis during total knee arthroplasty (TKA) and explored the factors that could affect the patterns of MM tears
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